Bench Dog Tools 10-067 Center Mortising Router Plate Predrilled hole pattern fits: Porter Cable 690/890 series, Makita 1100-1101 series Bosch 1617-1618 (fixed base only) and Dewalt DW616/DW618. 6-1/2-Inch diameter. 11/16-InchL guide posts. Makes making a mortise and tenon joint easy